(Fig. 7D)
Microdon ignotus Violovitsh, 1976. Novosti fauny Sibiri (Novye i maloizvestnye vidy fauny Sibiri, 10): 160.
Diagnosis. Lateral oral margins not produced. Scutum mainly long yellow pilose, except for posteromedial patches of black pile. Scutellum with slightly concave posterior margin, without calcars. Basotarsomere of proleg just a little wider than the apex of protibia. Postero-apical corner of cell r 4+5 rounded, without outward appendix. Length ratio of terga Ш–IV is about 1: 2.2.
Examined material: 1♂, Tiechashan, 500~ 950 m, Benxi, Liaoning province, 28.v.2006, leg. C.- T. Zhang (SYNU).